#14162: Core Lint error -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: | Keywords: TypeInType Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Here's a simpler version {{{ {-# Language TypeOperators, KindSignatures, DataKinds, PolyKinds, TypeFamilies, GADTs, TypeInType #-} module T14162 where import Data.Kind data SubList :: Maybe a -> Type where SubNil :: SubList 'Nothing data family Sing (a :: k) data instance Sing (x :: SubList ys) where SSubNil :: Sing SubNil }}} There's an ASSERT error in `substTy` too, if you compile with a -DDEBUG compiler -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14162#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler